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At the center of the forested corridor along the Sangamon River in this area is Allerton Park. The natural area is an example of a relatively undisturbed stream-valley ecosystem. It inlcudes bottomland forest, reclaimed prairie, and wetlands.

The major natural features of the Sangamon River RRA are the forest tract at Robert Allerton Park and the Sangamon River. The area is highly agricultural. This RRA is relatively small.

LANDCOVER : Nearly three-fourths of the Sangamon River RRA is cropland, the highest percentage among the RRAs. Fourteen percent of the RRA is grassland and 10% is wooded. Upland and bottomland wood percentages are moderately low. This site has the lowest acreage and lowest percentage of nonforested wetlands of the RRAs; there are only 49 acres of nonforested wetland identified in this site.

NATURAL AREAS : The two Natural Areas are Robert Allerton Park and the Sangamon River.

BIOLOGICALLY SIGNIFICANT STREAMS : A 15.5 mile stretch of the Sangamon River is designated as a BSS stream.

HERITAGE SITES : There are eight Heritage sites in this RRA representing four communities types, three animal species, and one large forest tract.